Printing-form.



W. J. P. MAIDHOF.

PRINTING FORM.

APPLIGATION FILED AUG. 19, 1911.

1,055,770, Patented Mar. 11,1913.

COLUMBIA PLANOGRAPH co.,wAsHlNOTON. D C

iiinrrnn s'ra'rns PATENT FFICE.

WILLIAM J. F. MAIDHOF, OF NEW YORK, N. Y.

PRINTING-FORM.

Specification of Letters Patent. Patented Mar. 11, 1913.

Original application filed October 6, 1909, Serial No. 521,355. Dividedand this application filed August 19,

To all whom it may concern:

Be it known that I, WILLIAM J. F. Memnor, a citizen of the UnitedStates, and resident of the borough of Bronx, in the clty and State ofNew York, have invented a new and useful Improvement in Printing- Forms,of which the following is a specification.

This invention relates to printing forms with the object in view ofproviding novel means for supporting the bases of the type blockswhereby a clearer and more preclse printing effect may be obtained.

Another object is to provide novel means for firmly securing andadjusting the type blocks in the printing frame or chase.

A further object is to provide certain improvements in the form,construction and arrangement of the various parts whereby theabove-mentioned objects may be more effectively carried out.

A practical embodiment of myunventlon is represented in the accompanyingdrawings, in which Figure 1 represents a face view of the printing formwith a series of type blocks secured therein, Fig. 2 represents, an edgeview of the same, Fig. 3 represents a section taken in the plane of theline A-A of Fig. 1, and Fig. 4 represents a section taken in the planeof the line BB of Fig.1.

The printing frame or chase comprises side members 1 2, and end members3, 4, secured together by screws 5. This frame is provided with abackplate 6 secured thereto by screws 7.

The printing frame is shown in the present instance as rectangular inform. The two opposite side members 1 and 2 of the frame are providedwith undercut grooves 8 fitted to receive the dove-tailed tongues 9 ofthe adjustable spacing bars 10, for holding the spacing bars in slidingengagement with the frame. These spacing bars are provided at their topwith lateral extensions 11 fitted to engage the recesses 12 1n the typeblocks 13 for holding the type blocks against removal from the framewith their bases against the back plate 6.

Centrally arranged lugs 14, 15, are secured to the members 1 and 2 byscrews 16, which lugs form bearings for the inner ends of adjustingscrews 17, in the present instance four in number, the outer ends ofwhich screws are mounted in the end mem- Serial No. 644,946.

bore 3 and 4 of the frame. These screws pass through and have a screwthreaded engagement with the adjustable spacing bars 10 whereby therotation of the screws will slide the adjustable spacing bars toward oraway from each other. These adjusting screws are provided with theenlarged portions 18, having holes therein adapted to receive a spanneror other convenient tool.

In operation, the adjusting screws are rotated so as to separate thespacing bars far enough to permit the insertion between them of the typeblocks 18. The type blocks are arranged in their desired relativeposition with respect to each other and the ad justing screws are thenrotated in the reverse direction thus forcing the spacing bars towardeach other and clamping the type blocks firmly in position therebetweenwith the bases of the type blocks resting on the back plate.

It will be seen that a great variety both in number and size of typeblocks may be used in connection with my apparatus and that any desiredrelative adjustment of the type blocks may be obtained. Furthermore, thefact that the chase or frame is provided with a back plate on which thebases of the type blocks rest provides a very firm and unyieldingprinting form with the result that the characters upon the type blocksare printed upon the desired material in a clearer and more precisecondition than has heretofore been obtainable.

It is to be understood that by the term type blocks any printing blockis included. It is also evident that various changes might be resortedto in the form, construction and arrangement of the several partswithout departing from the spirit and scope of my invention; hence I donot wish to limit myself strictly to the structure here in set forth,but

What I claim is l. A printing form comprising a chase or frame having aback plate, adjustable spacing bars and interposed lugs carried by thechase and adjusting screws pivoted in the lugs and chase and having ascrew threaded engagement with the adjustable spacing bars for movingthe bars toward and away from each other.

2. A printing form comprising a chase or frame composed of a back andside and end members secured thereto, a pair of adjust able spacing barshaving their ends slidably mounted in the side members, interposed fixedlugs and adjusting screws engaging the end member and said fixed lugsfor moving the adjustable spacing bars toward and away from each other.

3. A printing form comprising a chase or frame having a back plate, anadjustable spacing bar, fixed lugs and a pair of adjusting screwspivoted in the chase and lugs and having a screw threaded engagementwith the adjustable spacing bar for moving it toward and away from thefixed lugs.

4. A printing form comprising a chase or frame having a back plate,spacing bars and interposed fixed lugs and a pair of adjusting screwspivoted in the chase and fixed lugs and having a screw threadedengagement with one of said spacing bars for moving it toward and awayfrom the other spacing bar.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two witnesses, this sixteenth day of August 1911.

\VILLIAM J. F. MAIDHOF.

Witnesses:

F. GEORGE BARRY, HENRY C. THIEME.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

